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* threads.h, async.h, threads.c (SCM_CRITICAL_SECTION_START,

Browse source 
SCM_CRITICAL_SECTION_END): Moved here from threads.h since now
they also block/unblock execution of asyncs and call
scm_async_click which is declared in async.h but threads.h can not
include async.h since async.h already includes threads.h.
(scm_i_critical_section_level): New, for checking mistakes in the
use of the SCM_CRITICAL_SECTION_* macros.
(scm_i_critical_section_mutex): Make it a recursive mutex so that
critical sections can be nested.

* threads.h, threads.c (scm_frame_lock_mutex): New.
(scm_frame_critical_section): Take mutex as argument.
(framed_critical_section_mutex): New, used as default for above.
(scm_init_threads): Initialize it.
(scm_threads_prehistory): Do not initialize thread_admin_mutex and
scm_i_critical_section_mutex; both are initialized statically.
This commit is contained in:
Marius Vollmer 2005-03-07 21:30:24 +00:00
parent 673ba2da04
commit a4d106c70e
3 changed files with 50 additions and 18 deletions
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26
libguile/async.h
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@ -51,6 +51,32 @@ void *scm_c_call_with_unblocked_asyncs (void *(*p) (void *d), void *d);
void scm_frame_block_asyncs (void);
void scm_frame_unblock_asyncs (void);
/* Critical sections */
/* XXX - every critical section needs to be examined whether the
requirements for SCM_CRITICAL_SECTION_START/END are fulfilled. See
the manual.
*/
/* Defined in threads.c. scm_i_critical_section_level is only used
for error checking and will go away eventually. */
extern scm_i_pthread_mutex_t scm_i_critical_section_mutex;
extern int scm_i_critical_section_level;
#define SCM_CRITICAL_SECTION_START \
do { \
scm_i_pthread_mutex_lock (&scm_i_critical_section_mutex);\
SCM_I_CURRENT_THREAD->block_asyncs++; \
scm_i_critical_section_level++; \
} while (0)
#define SCM_CRITICAL_SECTION_END \
do { \
scm_i_critical_section_level--; \
SCM_I_CURRENT_THREAD->block_asyncs--; \
scm_i_pthread_mutex_unlock (&scm_i_critical_section_mutex); \
scm_async_click (); \
} while (0)
SCM_API void scm_init_async (void);
#if (SCM_ENABLE_DEPRECATED == 1)